Yinghai Lu
2008-01-29T09:00:20Z

[PATCH 2/2] x86_64: make early_node_mem return align address

boot oops when system get 64g or 128g installed

Calling initcall 0xffffffff80bc33b6: sctp_init+0x0/0x711()
BUG: unable to handle kernel NULL pointer dereference at 000000000000005f
IP: [<ffffffff802bfe55>] proc_register+0xe7/0x10f
PGD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.24-smp-g5a514e21-dirty #6
RIP: 0010:[<ffffffff802bfe55>] [<ffffffff802bfe55>] proc_register+0xe7/0x10f
RSP: 0000:ffff810824c57e60 EFLAGS: 00010246
RAX: 000000000000d7d7 RBX: ffff811024c5fa80 RCX: ffff810824c57e08
RDX: 0000000000000000 RSI: 0000000000000195 RDI: ffffffff80cc2460
RBP: ffffffffffffffff R08: 0000000000000000 R09: ffff811024c5fa80
R10: 0000000000000000 R11: 0000000000000002 R12: ffff810824c57e6c
R13: 0000000000000000 R14: ffff810824c57ee0 R15: 00000006abd25bee
FS: 0000000000000000(0000) GS:ffffffff80b4d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 000000000000005f CR3: 0000000000201000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper (pid: 1, threadinfo ffff810824c56000, task ffff812024c52000)
Stack: ffffffff80a57348 0000019500000000 ffff811024c5fa80 0000000000000000
00000000ffffff97 ffffffff802bfef0 0000000000000000 ffffffffffffffff
0000000000000000 ffffffff80bc3b4b ffff810824c57ee0 ffffffff80bc34a5
Call Trace:
[<ffffffff802bfef0>] ? create_proc_entry+0x73/0x8a
[<ffffffff80bc3b4b>] ? sctp_snmp_proc_init+0x1c/0x34
[<ffffffff80bc34a5>] ? sctp_init+0xef/0x711
[<ffffffff80b976e3>] ? kernel_init+0x175/0x2e1
[<ffffffff8020ccf8>] ? child_rip+0xa/0x12
[<ffffffff80b9756e>] ? kernel_init+0x0/0x2e1
[<ffffffff8020ccee>] ? child_rip+0x0/0x12

Code: 1e 48 83 7b 38 00 75 08 48 c7 43 38 f0 e8 82 80 48 83 7b 30 00 75 08 48 c7 43 30 d0 e9 82 80 48 c7 c7 60 24 cc 80 e8 bd 5a 54 00 <48> 8b 45 60 48 89 6b 58 48 89 5d 60 48 89 43 50 fe 05 f5 25 a0
RIP [<ffffffff802bfe55>] proc_register+0xe7/0x10f
RSP <ffff810824c57e60>
CR2: 000000000000005f
---[ end trace 02c2d78def82877a ]---
Kernel panic - not syncing: Attempted to kill init!

it turns out some variables near end of bss is corrupted already.

in System.map we have
ffffffff80d40420 b rsi_table
ffffffff80d40620 B krb5_seq_lock
ffffffff80d40628 b i.20437
ffffffff80d40630 b xprt_rdma_inline_write_padding
ffffffff80d40638 b sunrpc_table_header
ffffffff80d40640 b zero
ffffffff80d40644 b min_memreg
ffffffff80d40648 b rpcrdma_tk_lock_g
ffffffff80d40650 B sctp_assocs_id_lock
ffffffff80d40658 B proc_net_sctp
ffffffff80d40660 B sctp_assocs_id
ffffffff80d40680 B sysctl_sctp_mem
ffffffff80d40690 B sysctl_sctp_rmem
ffffffff80d406a0 B sysctl_sctp_wmem
ffffffff80d406b0 b sctp_ctl_socket
ffffffff80d406b8 b sctp_pf_inet6_specific
ffffffff80d406c0 b sctp_pf_inet_specific
ffffffff80d406c8 b sctp_af_v4_specific
ffffffff80d406d0 b sctp_af_v6_specific
ffffffff80d406d8 b sctp_rand.33270
ffffffff80d406dc b sctp_memory_pressure
ffffffff80d406e0 b sctp_sockets_allocated
ffffffff80d406e4 b sctp_memory_allocated
ffffffff80d406e8 b sctp_sysctl_header
ffffffff80d406f0 b zero
ffffffff80d406f4 A __bss_stop
ffffffff80d406f4 A _end

and setup_node_bootmem() will use that page 0xd40000 for bootmap
Bootmem setup node 0 0000000000000000-0000000828000000
NODE_DATA [000000000008a485 - 0000000000091484]
bootmap [0000000000d406f4 - 0000000000e456f3] pages 105
Bootmem setup node 1 0000000828000000-0000001028000000
NODE_DATA [0000000828000000 - 0000000828006fff]
bootmap [0000000828007000 - 0000000828106fff] pages 100
Bootmem setup node 2 0000001028000000-0000001828000000
NODE_DATA [0000001028000000 - 0000001028006fff]
bootmap [0000001028007000 - 0000001028106fff] pages 100
Bootmem setup node 3 0000001828000000-0000002028000000
NODE_DATA [0000001828000000 - 0000001828006fff]
bootmap [0000001828007000 - 0000001828106fff] pages 100

actually, setup_node_bootmem hope to make NODE_DATA to be ZONE_ALIGN (1<<(11+12)),
and bootmap will after that in PAGE.

the patch update early_node_mem, and find_e820_mem to make sure we can extra range
for alignment.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>

Index: linux-2.6/arch/x86/kernel/e820_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820_64.c
+++ linux-2.6/arch/x86/kernel/e820_64.c
@@ -169,9 +169,10 @@ int __init e820_all_mapped(unsigned long
* Find a free area in a specific range.
*/
unsigned long __init find_e820_area(unsigned long start, unsigned long end,
- unsigned size)
+ unsigned size, unsigned long align)
{
int i;
+ unsigned long mask = ~(align - 1);

for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
@@ -185,7 +186,7 @@ unsigned long __init find_e820_area(unsi
continue;
while (bad_addr(&addr, size) && addr+size <= ei->addr+ei->size)
;
- last = PAGE_ALIGN(addr) + size;
+ last = ((addr + align - 1) & mask) + size;
if (last > ei->addr + ei->size)
continue;
if (last > end)
Index: linux-2.6/arch/x86/kernel/setup_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_64.c
+++ linux-2.6/arch/x86/kernel/setup_64.c
@@ -182,7 +182,8 @@ contig_initmem_init(unsigned long start_
unsigned long bootmap_size, bootmap;

bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
- bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
+ bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
+ PAGE_SIZE);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n", bootmap_size);
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
Index: linux-2.6/arch/x86/mm/init_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_64.c
+++ linux-2.6/arch/x86/mm/init_64.c
@@ -354,7 +354,7 @@ static void __init find_early_table_spac
* need roughly 0.5KB per GB.
*/
start = 0x8000;
- table_start = find_e820_area(start, end, tables);
+ table_start = find_e820_area(start, end, tables, PAGE_SIZE);
if (table_start == -1UL)
panic("Cannot find space for the kernel page tables");

Index: linux-2.6/arch/x86/mm/numa_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/numa_64.c
+++ linux-2.6/arch/x86/mm/numa_64.c
@@ -94,7 +94,7 @@ static int __init allocate_cachealigned_
pad_addr = 0x8000;
nodemap_size = pad + memnodemapsize;
nodemap_addr = find_e820_area(pad_addr, end_pfn<<PAGE_SHIFT,
- nodemap_size);
+ nodemap_size, PAGE_SIZE);
if (nodemap_addr == -1UL) {
printk(KERN_ERR
"NUMA: Unable to allocate Memory to Node hash map\n");
@@ -164,13 +164,16 @@ int early_pfn_to_nid(unsigned long pfn)
}

static void * __init early_node_mem(int nodeid, unsigned long start,
- unsigned long end, unsigned long size)
+ unsigned long end, unsigned long size,
+ unsigned long align)
{
- unsigned long mem = find_e820_area(start, end, size);
+ unsigned long mem = find_e820_area(start, end, size, align);
void *ptr;

- if (mem != -1L)
+ if (mem != -1L) {
+ mem = round_up(mem, align);
return __va(mem);
+ }
ptr = __alloc_bootmem_nopanic(size,
SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS));
if (ptr == NULL) {
@@ -198,7 +201,8 @@ void __init setup_node_bootmem(int nodei
start_pfn = start >> PAGE_SHIFT;
end_pfn = end >> PAGE_SHIFT;

- node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size);
+ node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size,
+ ZONE_ALIGN);
if (node_data[nodeid] == NULL)
return;
nodedata_phys = __pa(node_data[nodeid]);
@@ -213,7 +217,7 @@ void __init setup_node_bootmem(int nodei
bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
bootmap = early_node_mem(nodeid, bootmap_start, end,
- bootmap_pages<<PAGE_SHIFT);
+ bootmap_pages<<PAGE_SHIFT, PAGE_SIZE);
if (bootmap == NULL) {
if (nodedata_phys < start || nodedata_phys >= end)
free_bootmem((unsigned long)node_data[nodeid],
Index: linux-2.6/include/asm-x86/e820_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/e820_64.h
+++ linux-2.6/include/asm-x86/e820_64.h
@@ -15,7 +15,7 @@

#ifndef __ASSEMBLY__
extern unsigned long find_e820_area(unsigned long start, unsigned long end,
- unsigned size);
+ unsigned size, unsigned long align);
extern void add_memory_region(unsigned long start, unsigned long size,
int type);
extern void setup_memory_region(void);